Manufacturer: VAG (VW, Audi, Skoda, Seat)
Brand: Siemens
Model: SIMOS 2.1
Function: Immo off
Emulator: No
SIMOS 2.1 Immo off
If you’re working with Siemens Simos 2.1 ECUs and need a reliable immobilizer bypass, we offer a proven immo off solution tailored for select Volkswagen and Skoda vehicles.
Whether you’re replacing a faulty ECU or need to disable the immobilizer for tuning or diagnostics, our solution provides permanent, EEPROM-level deactivation without key coding.
ECU details
The Siemens Simos 2.1 ECU is commonly installed in late-90s to early-2000s VAG models with 1.6L petrol engines. Our immo off service involves modifying internal flash memory to fully deactivate the immobilizer system, allowing the engine to start independently of the vehicle’s original key.
Vehicle models equipped with Siemens Simos 2.1 ECU
Below are some of the vehicle models equipped with the Siemens Simos 2.1 ECU :
- Skoda Felicia
- Volkswagen Golf 4
- Volkswagen Bora
Not to be confused with immo off for PCR2.1, which refers to a different ECU model with distinct hardware and software architecture, requiring a separate approach and tools for immobilizer removal. While both involve bypassing the immobilizer function, the procedures and considerations vary significantly between the two systems.
Immo off procedure for SIMOS 2.1: Step-by-Step with CK Decode
Using CK Decode to disable the immobilizer on the Siemens SIMOS 2.1 is a structured process that ensures accuracy and reliability.
The software automates key modifications, reducing the risk of errors, below are the essential steps to follow:
- Download CKDecode through this link
- Click on the Functions Tab and select VAG – Siemens – SIMOS 2.1 – Immo off
- Read EEPROM with your interface and upload the file
- Click Process button
- Write the file processed by CKDecode
